23156645 has 8 divisors (see below), whose sum is σ = 28746360. Its totient is φ = 17886400.

The previous prime is 23156641. The next prime is 23156671. The reversal of 23156645 is 54665132.

It can be written as a sum of positive squares in 4 ways, for example, as 2563201 + 20593444 = 1601^2 + 4538^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 23156645 - 2² = 23156641 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23156641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79706 + ... + 79995.

It is an arithmetic number, because the mean of its divisors is an integer number (3593295).

Almost surely, 2^23156645 is an apocalyptic number.

It is an amenable number.

23156645 is a deficient number, since it is larger than the sum of its proper divisors (5589715).

23156645 is a wasteful number, since it uses less digits than its factorization.

23156645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159735.

The product of its digits is 21600, while the sum is 32.

The square root of 23156645 is about 4812.1351809774. The cubic root of 23156645 is about 285.0308574366.

The spelling of 23156645 in words is "twenty-three million, one hundred fifty-six thousand, six hundred forty-five".